Anyway, I’m not sure this agrees with you. You’ve been saying you shouldn’t smush encounters together, but that’s exactly what he says he’s doing there at the end. If the general message needs to be “don't smush your encounters together”, I don’t see how this supports that. Even James Jacobs chimes in to say they expect people to adjust things and run them dynamically and reactively to what the PCs are doing.
If the problem is that official adventures (published so far) seem like they want you to do one thing but don’t support that very well as written, then I’m not sure there’s much contention here about that. Maybe we’re just talking past each other, but I also think it’s not is not particularly helpful for clarity to frame something as a general message when it’s actually more specific.
For the umpteenth time, I am not saying it
can't be done. I'm saying that budding PF2 gamesmasters should hold off doing it. I'm saying
don't smush your encounters together.
I am saying that the natural and intuitive approach, which is to move the monsters from room 13 into room 15 where another bunch of monsters already live for reasons
DOES. NOT. WORK.
It worked in 3e. It worked in PF1. It totally works in 5E.
It risks ruining your whole campaign in PF2.
(In those other games, the damage per round of the party coasting along conserving resources is
significantly lower than the party going into panic nova mode. This approach to game design is completely absent from PF2 until higher level spells kick in, and martial characters can
never shift gears.
That's the difference)
So as a general and simple message,
don't smush together your encounters.
A more complex and accurate message would be "change encounters around, modifying monsters and/or numbers and/or the timing of their arrival and/or terrain and other factors". But since neither the CRB nor the GMG spends even a single word acknowledging this to be a real problem, it is neither simple nor direct. (Paizo only discuss
creating encounters. Not how to
combine - or not to combine - encounters)
Edit: see my post below where I back this up.
I prefer simple and direct so I'll stick to the very good advice
don't smush your encounters together.